\( A \) and \( B \) are two independent events such that their probabilities are \( \frac{3}{10}...

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\( A \) and \( B \) are two independent events such that their probabilities are \( \frac{3}{10} \) and \( \frac{2}{5} \) respectively. The probability of exactly one of the events happening, is
(A) \( 23 / 50 \)
(B) \( 1 / 2 \)
(C) \( 31 / 50 \)
(D) none of these
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